Move /webrtc/api/android files to /webrtc/sdk/android

I decided to make one webrtc/sdk/android/BUILD.gn for both tests and Java/jni src.

External dependencies needs to be updated after this CL.

Future work is required to clean up the Android api and move
implementation details to /webrtc/sdk/android/src.

BUG=webrtc:5882,webrtc:6804
NOPRESUBMIT=True

Review-Url: https://codereview.webrtc.org/2547483003
Cr-Commit-Position: refs/heads/master@{#15443}

webrtc/sdk/android/src/jni/native_handle_impl.h

@@ -0,0 +1,87 @@
+/*
+ *  Copyright 2015 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+#ifndef WEBRTC_SDK_ANDROID_SRC_JNI_NATIVE_HANDLE_IMPL_H_
+#define WEBRTC_SDK_ANDROID_SRC_JNI_NATIVE_HANDLE_IMPL_H_
+
+#include <jni.h>
+
+#include "webrtc/common_video/include/video_frame_buffer.h"
+#include "webrtc/common_video/rotation.h"
+
+namespace webrtc_jni {
+
+// Open gl texture matrix, in column-major order. Operations are
+// in-place.
+class Matrix {
+ public:
+  Matrix(JNIEnv* jni, jfloatArray a);
+
+  jfloatArray ToJava(JNIEnv* jni);
+
+  // Crop arguments are relative to original size.
+  void Crop(float cropped_width,
+            float cropped_height,
+            float crop_x,
+            float crop_y);
+
+  void Rotate(webrtc::VideoRotation rotation);
+
+ private:
+  static void Multiply(const float a[16], const float b[16], float result[16]);
+  float elem_[16];
+};
+
+// Wrapper for texture object.
+struct NativeHandleImpl {
+  NativeHandleImpl(JNIEnv* jni,
+                   jint j_oes_texture_id,
+                   jfloatArray j_transform_matrix);
+
+  NativeHandleImpl(int id, const Matrix& matrix);
+
+  const int oes_texture_id;
+  Matrix sampling_matrix;
+};
+
+class AndroidTextureBuffer : public webrtc::NativeHandleBuffer {
+ public:
+  AndroidTextureBuffer(int width,
+                       int height,
+                       const NativeHandleImpl& native_handle,
+                       jobject surface_texture_helper,
+                       const rtc::Callback0<void>& no_longer_used);
+  ~AndroidTextureBuffer();
+  rtc::scoped_refptr<VideoFrameBuffer> NativeToI420Buffer() override;
+
+  // First crop, then scale to dst resolution, and then rotate.
+  rtc::scoped_refptr<AndroidTextureBuffer> CropScaleAndRotate(
+      int cropped_width,
+      int cropped_height,
+      int crop_x,
+      int crop_y,
+      int dst_width,
+      int dst_height,
+      webrtc::VideoRotation rotation);
+
+ private:
+  NativeHandleImpl native_handle_;
+  // Raw object pointer, relying on the caller, i.e.,
+  // AndroidVideoCapturerJni or the C++ SurfaceTextureHelper, to keep
+  // a global reference. TODO(nisse): Make this a reference to the C++
+  // SurfaceTextureHelper instead, but that requires some refactoring
+  // of AndroidVideoCapturerJni.
+  jobject surface_texture_helper_;
+  rtc::Callback0<void> no_longer_used_cb_;
+};
+
+}  // namespace webrtc_jni
+
+#endif  // WEBRTC_SDK_ANDROID_SRC_JNI_NATIVE_HANDLE_IMPL_H_